Drilling and grouting integrated device for treating relatively thick sediment after pile formation

Abstract

The invention belongs to the technical field of bored pile foundation construction in infrastructure construction projects such as buildings, highways, railways and municipal construction, and specifically relates to a drilling and grouting integrated device for treating relatively thick sediment after pile formation. The device includes hole sweeping devices and a grouting pipe assembly. The holesweeping devices are arranged on the upper part of the grouting pipe assembly. The hole sweeping devices comprise the upper hole sweeping device and the bottom hole sweeping device, the upper hole sweeping device is arranged on the upper part of the bottom hole sweeping device, the upper hole sweeping device comprises an upper drill rod part, upper sweeping holes and an upper hole sweeping wire rope, a coupling is fixedly connected with the upper drill rod part, and the upper sweeping holes are evenly distributed in the upper drill rod part; the bottom hole sweeping device comprises a bottomdrill rod part, a clamping piece and a bottom hole sweeping wire rope, the bottom hole sweeping wire rope is fixed to the bottom drill rod part, the bottom hole sweeping wire rope is fixedly connectedwith the bottom drill rod part through the clamping piece, the bottom drill rod part is arranged on the lower part of the upper drill rod part, the clamping piece is arranged on a lower drill rod part, and the two ends of the clamping piece are welded and fixed to the side wall of the lower drill rod part. The device is simple to manufacture and convenient to use, the risk of handling again afterblind grouting due to poor cleaning of the sediment at the bottom of the pile foundation is greatly reduced, and the pile foundation quality defects are treated in one step.

Description

technical field [0001] The invention belongs to the technical field of bored pile foundation construction in infrastructure construction projects such as buildings, highways, railways, municipal facilities, etc., and in particular relates to a drilling and irrigation integrated device for processing thick sediment after pile formation. Background technique [0002] Bored piles have the advantages of high bearing capacity, good seismic performance, and convenient construction. They are widely used in various infrastructure construction projects. The pile foundation belongs to underground engineering, which is restricted by geological conditions. Due to the complexity of various engineering geological conditions The pile foundation is prone to quality problems, especially the pile length caused by excessive sediment at the bottom of the pile is not as long as the design requirement, the pile body is incomplete, and the axial bearing capacity of a single pile is insufficient, re...

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Problems solved by technology

[0002] Bored piles have the advantages of high bearing capacity, good seismic performance, and convenient construction. They are widely used in various infrastructure construction projects. The pile foundation belongs to underground engineering, which is restricted by geological conditions. Due to the complexity of various engineering geological conditions and diversity, resulting in pile foundations prone to quality problems, especially problems such as pile length not meeting the design requirements, incomplete pile body and insufficient axial bearing capacity of single piles caused by excessive sediment at the bottom of the pile, resulting in hidden dangers to quality and safety

After the pile foundation is bored, the quality of the pile hole will be detected through the hole inspection. If the sediment exceeds the design and specification requirements at this time, the thickness of the sediment can be reduced by cleaning the hole. However, after the pile foundation age reaches the design and specification requirements , the quality of piles can only be detected by low-strain method, coring method, ultrasonic detection method and single pile static load test. When the sediment at the bottom of the pile is sand and the groundwater level is high, the sand will become denser and denser under the soaking of water. The pressure loss of the jet air or water flow of the nozzle of the traditional high-pressure rotary jet drilling rig is too large in the high water level. The effect of the sand layer is not obvious. After using the traditional method, grouting is carried out at the bottom of the pile foundation and then tested. The quality of the pile body still cannot meet the design and specification requirements, and the cost of continuing treatment will increase virtually.

[0003] The pressure loss of jet airflow or water flow in the high water level of the traditional high-pressure rotary jet drilling rig is too large, the effect of cleaning sediment (especially the dense sand layer) is not obvious, and the quality of the pile body cannot meet the design and specification requirements, and it still needs to be treated again. Waste of manpower, material resources, financial resources and time

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